用所给词的适当形式填空。
1. Don't be ________ (worry) about his English. He can learn it well.
2. Tom is a lovely boy, many people like ________ (he).
3. Mike's ________ (parent) are doctors. They work in the same hospital.
4. There are fifty students in our class. They come from different ________ (country).
5. They go to the zoo by subway. It takes ________ (they) 30 minutes to get there.
6. Tom is crazy about ________ (play) computer games, so he is weak in his study.
7. I have a dream, I want ________ (fly) into the space someday.
8. Are you interested in ________ (see) English movies?
9. There aren't ________ (some) flowers in front of the house.
10. We go to school by bike. It takes ________ (we) 15 minutes to get there.